Jessica Simpson -- Unplugged and Unglued

Jessica Simpson -- Unplugged and Unglued

2/7/2009 3:00 PM PST BY TMZ STAFF

While trying to convince the world she's a country singer in Grand Rapids, MI last Thursday, Jessica Simpson made a fatal error -- no lip-synching!

Seen in this video from woodradio.com, nearly every song was a disaster while Simpson fought with her earpiece monitor, mumbled through most of her lyrics, and at one point talked through tears. On a brighter note, she didn't look fat!